Södertörn [sødəˈʈœːɳ] is an island in Sweden, making up the eastern part of the Södermanland province, protruding into the Baltic Sea.

Northern Södertörn is a part of Stockholm municipality called Söderort. This article covers mainland Södertörn except Stockholm municipality, namely Botkyrka, Haninge, Huddinge, Nynäshamn, Salem and Tyresö. North-eastern Södertörn is part of another municipality called Nacka, which is described in our guide to the Stockholm archipelago. The municipality of Södertälje, to the west of Södertörn, has its own article on Wikivoyage.

All built-up areas in Södertörn are served by SL, Stockholm's public transport company. See Stockholm County#Public transit. It is possible to take a bicycle to the train free of charge. Bikes are not allowed in the trains during rush-hours (06.00 to 09.00 and 15.00 to 18.00) between Stockholm and Västerhaninge. This is important to notice if one has to catch a ferry in Nynäshamn that leaves in the early evening hours. One should choose the first part of the train, because the second often goes only to Västerhaninge.

Tumba Papermill Museum. The paper mill in Tumba has a 250-year history of making Swedish banknotes. The exhibitions tell the story of the Bank of Sweden, the world's first central bank, as well as the first one to issue paper money.

Tyresta National Park. 20 kilometres south-east of central Stockholm. A part of the park was devastated by a wildfire in 1999. The park management lets it recover naturally.

Bornsjön— For a real wild animal safari close to Stockholm, Bornsjön is the best spot. It is a nature reserve 30 minutes drive south of Stockholm. The natural environment is perfect here for watching mammals like moose, roe deer and wild boar. Stockholm Outback offers tours down to the reserve every evening during the summer. For further information call +46 73-6578708 or visit their homepage [1].